<SEC-DOCUMENT>0001144204-18-037079.txt : 20180703
<SEC-HEADER>0001144204-18-037079.hdr.sgml : 20180703
<ACCEPTANCE-DATETIME>20180703090701
ACCESSION NUMBER:		0001144204-18-037079
CONFORMED SUBMISSION TYPE:	8-A12B/A
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20180703
DATE AS OF CHANGE:		20180703

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SINOVAC BIOTECH LTD
		CENTRAL INDEX KEY:			0001084201
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			B9
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		8-A12B/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-32371
		FILM NUMBER:		18934846

	BUSINESS ADDRESS:	
		STREET 1:		NO. 15 ZHI TONG ROAD,
		STREET 2:		ZHONGGUANCUN TECH PARK, CHANGPING DISTR.
		CITY:			BEIJING
		STATE:			F4
		ZIP:			102200
		BUSINESS PHONE:		86-10-82890088

	MAIL ADDRESS:	
		STREET 1:		NO. 15 ZHI TONG ROAD,
		STREET 2:		ZHONGGUANCUN TECH PARK, CHANGPING DISTR.
		CITY:			BEIJING
		STATE:			F4
		ZIP:			102200

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	NET FORCE SYSTEMS INC
		DATE OF NAME CHANGE:	19991110
</SEC-HEADER>
<DOCUMENT>
<TYPE>8-A12B/A
<SEQUENCE>1
<FILENAME>tv497878_8a12ba.htm
<DESCRIPTION>8-A12B/A
<TEXT>
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<P STYLE="font: 18pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>UNITED STATES</B></P>

<P STYLE="font: 18pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>SECURITIES AND EXCHANGE COMMISSION</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="text-transform: uppercase"><B>W</B></FONT><B>ashington<FONT STYLE="text-transform: uppercase">,
D.C.&nbsp; 20549</FONT></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>



<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 18pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>FORM 8-A</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Amendment No. 4</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>



<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>FOR REGISTRATION OF CERTAIN CLASSES OF
SECURITIES</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>PURSUANT TO SECTION 12(b) OR 12(g) OF
THE </B><BR>
<B>SECURITIES EXCHANGE ACT OF 1934</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 18pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>SINOVAC BIOTECH LTD.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>(Exact name of registrant as specified
in its charter)</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR>
    <TD STYLE="vertical-align: top; width: 50%; text-align: center; padding: 0; text-indent: 0"><B>Antigua, West Indies</B></TD>
    <TD STYLE="vertical-align: top; width: 50%; padding: 0; text-align: center; text-indent: 0"><B>Not Applicable</B></TD></TR>
<TR>
    <TD STYLE="vertical-align: top; text-align: center; padding: 0; text-indent: 0"><FONT STYLE="font-size: 10pt"><B>(State or other jurisdiction</B></FONT></TD>
    <TD STYLE="vertical-align: top; text-align: center; padding: 0; text-indent: 0"><FONT STYLE="font-size: 10pt"><B>(I.R.S. Employer Identification</B></FONT></TD></TR>
<TR>
    <TD STYLE="vertical-align: top; text-align: center; padding: 0; text-indent: 0"><FONT STYLE="font-size: 10pt"><B>of incorporation or organization)</B></FONT></TD>
    <TD STYLE="vertical-align: top; text-align: center; padding: 0; text-indent: 0"><FONT STYLE="font-size: 10pt"><B>Number)</B></FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR>
    <TD STYLE="vertical-align: top; width: 50%; padding: 0; text-indent: 0">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>No. 15 Zhi Tong Road,</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Zhongguancun Science and Technology Park</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Changping District, Beijing 102200</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>People&rsquo;s Republic of China</B></P></TD>
    <TD STYLE="text-align: center; width: 50%; padding: 0; vertical-align: bottom; text-indent: 0">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>&nbsp;</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>&nbsp;</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Not Applicable</B></P></TD></TR>
<TR>
    <TD STYLE="vertical-align: top; text-align: center; padding: 0; text-indent: 0"><FONT STYLE="font-size: 10pt"><B>(Address of Principal Executive Offices)</B></FONT></TD>
    <TD STYLE="vertical-align: top; text-align: center; padding: 0; text-indent: 0"><FONT STYLE="font-size: 10pt"><B>(Zip Code)</B></FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">Securities to be registered pursuant to
Section 12(b) of the Act:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR>
    <TD STYLE="width: 49%; padding: 0; border-bottom: Black 1pt solid; text-indent: 0">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Title of each class</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>to be so registered</B></P></TD>
    <TD STYLE="width: 2%; padding: 0; text-align: center; text-indent: 0">&nbsp;</TD>
    <TD STYLE="width: 49%; padding: 0; border-bottom: Black 1pt solid; text-indent: 0">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Name of each exchange on which each </B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>class is to be registered</B></P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 0; text-align: center; text-indent: 0">Preferred Share Purchase Rights</TD>
    <TD STYLE="padding: 0; text-indent: 0">&nbsp;</TD>
    <TD STYLE="padding: 0; text-align: center; text-indent: 0">The NASDAQ Stock Market LLC</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 6pt; text-indent: -6pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 6pt; text-indent: -6pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">If this form relates to the registration of a class of securities
pursuant to Section 12(b) of the Exchange Act and is effective pursuant to General Instruction A.(c), check the following box.
<FONT STYLE="font-family: Wingdings">&thorn;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">If this form relates to the registration of a class of securities
pursuant to Section 12(g) of the Exchange Act and is effective pursuant to General Instruction A.(d), check the following box.
<FONT STYLE="font-family: Wingdings">o</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Securities Act registration statement file number to which this
form relates: Not applicable (if applicable)</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Securities to be registered pursuant to Section 12(g) of the
Act: None.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0in"><B>Item 1. Description
of Registrant&rsquo;s Securities to be Registered</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0in">Reference is hereby made to:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0in">(i) the Registration Statement on
Form 8-A filed by Sinovac Biotech Ltd., an Antigua and Barbuda company (the &ldquo;<U>Company</U>&rdquo;), with the Securities
and Exchange Commission (the &ldquo;<U>SEC</U>&rdquo;) on March 29, 2016 (the &ldquo;<U>Registration Statement</U>&rdquo;), relating
to the Rights Agreement, dated as of March 28, 2016 (the &ldquo;<U>Original Rights Agreement</U>&rdquo;), between the Company and
Pacific Stock Transfer Company, as rights agent (the &ldquo;<U>Rights Agent</U>&rdquo;);</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0in">(ii) Amendment No. 1 to the Registration
Statement filed by the Company with the SEC on Form 8-A/A on March 24, 2017 (&ldquo;<U>Registration Statement Amendment No.
1</U>&rdquo;), relating to the Rights Agreement, as amended by the Amendment to the Rights Agreement, dated as of March 24, 2017,
between the Company and the Rights Agent (the &ldquo;<U>First Rights Agreement Amendment</U>&rdquo;);</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0in">(iii) Amendment No. 2 to the Registration
Statement filed by the Company with the SEC on Form 8-A/A on June 30, 2017 (&ldquo;<U>Registration Statement Amendment No.
2</U>&rdquo;), relating to the Rights Agreement, as amended by the Second Amendment to the Rights Agreement, dated as of June 26,
2017, between the Company and the Rights Agent (the &ldquo;<U>Second Rights Agreement Amendment</U>&rdquo;); and</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0in">(iv) Amendment No. 3 to the
Registration Statement filed by the Company with the SEC on Form 8-A/A on March 6, 2018 (&ldquo;<U>Registration Statement
Amendment No. 3</U>&rdquo;, together with Registration Statement Amendment No. 1 and Registration Statement Amendment No.
2, the &ldquo;<U>Prior Registration Statement Amendments</U>&rdquo;), relating to the Rights Agreement, as amended by the
Third Amendment to the Rights Agreement, dated as of March 6, 2017, between the Company and the Rights Agent (the
&ldquo;<U>Third Rights Agreement Amendment</U>&rdquo;, together with the First Rights Agreement Amendment and the Second
Rights Agreement Amendment, the &ldquo;<U>Prior Rights Agreement Amendments</U>&rdquo;).</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0in">The Original Rights Agreement, as amended
by the Prior Rights Agreement Amendments, is referred to herein as the &ldquo;<U>Rights Agreement</U>.&rdquo; Each of the Registration
Statement and the Prior Registration Statement Amendments is incorporated herein by reference.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0in">On July 2, 2018, the Company entered into
a Securities Purchase Agreement (the &ldquo;<U>Purchase Agreement</U>&rdquo;) with Vivo Capital, LLC and Prime Success, L.P. (each
an &ldquo;<U>Investor</U>&rdquo;, and collectively, the &ldquo;<U>Investors</U>&rdquo;), pursuant to which the Company, in a private
placement (the &ldquo;<U>Private Placement</U>&rdquo;), issued and sold to the Investors an aggregate of 11,800,000 common shares
of the Company, par value $0.001 per share (the &ldquo;<U>Shares</U>&rdquo;). In connection with the Purchase Agreement and the
Private Placement, the Company also entered into a Shareholders Agreement, Promissory Notes, an Equity Commitment Letter and the
Registration Rights Agreement with the Investors (each as defined in the Purchase Agreement, collectively, and together with the
Purchase Agreement and any other documents contemplated thereby or necessary or appropriate in connection therewith, the &ldquo;<U>Transaction
Documents</U>&rdquo;).</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0in"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0in">&nbsp;&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0in">Immediately prior to the execution of the
Purchase Agreement and completion of the Private Placement, on July 2, 2018, the Company entered into the Fourth Amendment to the
Rights Agreement with the Rights Agent (the &ldquo;<U>Fourth Rights Agreement Amendment</U>&rdquo;), which provides, among other
things, that:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 37.4pt 0pt 0.5in; text-indent: 0in">(i) the Investors, their direct
and indirect shareholders and their respective Affiliates and Associates (as defined in the Rights Agreement) will be exempt from
the Rights Agreement to the extent that their beneficial ownership of any common shares of the Company pursuant to or arising out
of the execution of the Purchase Agreement or the Transaction Documents, or the consummation of the Private Placement or any of
the other transactions contemplated thereby, which shall include any subsequent acquisition of any common shares up to the Maximum
Ownership Percentage (as defined in the Shareholders Agreement); and</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 37.4pt 0pt 0.5in; text-indent: 0in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 37.4pt 0pt 0.5in; text-indent: 0in">(ii) none of the execution,
delivery or performance of the Purchase Agreement or the Transaction Documents, or the consummation of the Private Placement or
any of the transactions contemplated thereby, will permit the Rights (as defined in the Rights Agreement) to be exercised.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 37.4pt 0pt 0.5in; text-indent: 0in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0in"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0in">The foregoing summaries of the Rights Agreement
and Fourth Rights Agreement Amendment are qualified in their entirety by reference to (i)&nbsp;the full text of the Fourth Rights
Agreement Amendment, which was filed as Exhibit 99.9 to the Company&rsquo;s Form 6-K filed with the SEC on July 3, 2018; (ii)
the Original Rights Agreement and the summary of its material terms which were filed with the SEC on Form 6-K on March 29, 2016
and are incorporated herein by reference; (iii) the First Rights Agreement Amendment and the summary of its material terms which
were filed with the SEC on Form 6-K on March 24, 2017; (iv) the Second Rights Agreement Amendment and the summary of its material
terms which were filed with the SEC on Form 6-K on June 30, 2017 and are incorporated herein by reference; and (v) the Third Rights
Agreement Amendment and the summary of its material terms which were filed with the SEC on March 6, 2018 and are incorporated
herein by reference.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Item 2. Exhibits</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>&nbsp;</B></P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in">1.</TD><TD>Fourth Amendment to Right Agreement, dated as of July 2, 2018, between Sinovac Biotech Ltd. and Pacific Stock Transfer Company,
as Rights Agent (incorporated herein by reference to Exhibit 99.9 of the Report on Form 6-K dated July 3, 2018 of Sinovac Biotech
Ltd.)</TD></TR></TABLE>

<P STYLE="margin-top: 0pt; margin-bottom: 0pt; font: 10pt Times New Roman, Times, Serif">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in">2.</TD><TD>Third Amendment to Rights Agreement, dated as of March 6, 2018, between Sinovac Biotech Ltd. and Pacific Stock Transfer Company,
as Rights Agent (incorporated herein by reference to Exhibit 4.1 of the Report on Form 6-K dated March 6, 2018 of Sinovac Biotech
Ltd.)</TD></TR></TABLE>

<P STYLE="margin-top: 0pt; margin-bottom: 0pt; font: 10pt Times New Roman, Times, Serif">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in">3.</TD><TD>Second Amendment to Rights Agreement, dated as of June 26, 2017, between Sinovac Biotech Ltd. and Pacific Stock Transfer Company,
as Rights Agent (incorporated herein by reference to Exhibit 4.1 of the Report on Form 6-K dated June 30, 2017 of Sinovac Biotech
Ltd.)</TD></TR></TABLE>

<P STYLE="margin-top: 0pt; margin-bottom: 0pt; font: 10pt Times New Roman, Times, Serif">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in">4.</TD><TD>Amendment to Rights Agreement, dated as of March 24, 2017, between Sinovac Biotech Ltd. and Pacific Stock Transfer Company,
as Rights Agent (incorporated herein by reference to Exhibit 4.1 of the Report on Form 6-K dated March 24, 2017 of Sinovac Biotech
Ltd.)</TD></TR></TABLE>

<P STYLE="margin-top: 0pt; margin-bottom: 0pt; font: 10pt Times New Roman, Times, Serif">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in">5.</TD><TD>Rights Agreement, dated as of March 28, 2016, between Sinovac Biotech Ltd. and Pacific Stock Transfer Company, as Rights Agent,
which includes the Form of Certificate of Designations of Series A Junior Participating Preferred Shares as Exhibit A, the Form
of Right Certificate as Exhibit&nbsp;B and the Summary of Rights to Purchase Preferred Shares as Exhibit C (incorporated by reference
to Exhibit 4.1 of the Report on Form 6-K dated March 29, 2016 of Sinovac Biotech Ltd.)</TD></TR></TABLE>

<P STYLE="margin-top: 0pt; margin-bottom: 0pt; font: 10pt Times New Roman, Times, Serif">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>SIGNATURE</B></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Pursuant to the requirements of Section
12 of the Securities Exchange Act of 1934, the registrant has duly caused this registration statement to be signed on its behalf
by the undersigned, thereto duly authorized.</P>

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    <TD COLSPAN="2" STYLE="padding: 0; text-indent: 0"><B>SINOVAC BIOTECH LTD.</B></TD></TR>
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    <TD STYLE="padding: 0; text-indent: 0">By:</TD>
    <TD STYLE="padding: 0; text-indent: 0; border-bottom: Black 1pt solid">/s/ Nan Wang</TD></TR>
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    <TD STYLE="padding: 0; text-indent: 0">&nbsp;</TD>
    <TD STYLE="padding: 0; text-indent: 0">Name:</TD>
    <TD STYLE="padding: 0; text-indent: 0">Nan Wang</TD></TR>
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    <TD STYLE="padding: 0; text-indent: 0">&nbsp;</TD>
    <TD STYLE="padding: 0; text-indent: 0">Title:</TD>
    <TD STYLE="padding: 0; text-indent: 0">Chief Financial Officer</TD></TR>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Date: July 3, 2018</P>

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